I am currently experencing a high fuel consuption on my 2004 130 Tdi galaxy. its been into the dealer twice and they say no fault codes are showing. Although with when i challenged them with extensive knowledge on a possible Aux heater fault, what do you know they suddenly found a fault code. The syptoms are a lower performance in power and recent white smoke from exaust when starting. My current performance is 29mpg, my previous 115 model got 38-40mpg and others i have spoken to agree with this figure. Any ideas or comments to takle frauds with?